code: def test_custom_timesteps_increasing_order(self):
      scheduler_class = self.scheduler_classes[0]
      scheduler_config = self.get_scheduler_config()
      scheduler = scheduler_class(**scheduler_config)
  
      timesteps = [100, 87, 50, 51, 0]
  
      with self.assertRaises(
          ValueError,
          msg="`custom_timesteps` must be in descending order.",
      ):
          scheduler.set_timesteps(timesteps=timesteps)
  
imports: import tempfile
  from typing import Dict, List, Tuple
  import torch
  from diffusers import LCMScheduler
  from diffusers.utils.testing_utils import torch_device
  from .test_schedulers import SchedulerCommonTest
label_desc: Use image node_id 19 for calling the LCMSchedulerTest obj's underlying member method code with example usage: obj.test_custom_timesteps_increasing_order() without return types